Drill bit



Aug. 21, 11923.

S. F. BASHARA DRILL BIT INVENIIOR l 7. i' autZam- Filed March 9 FIG. 6

ATTORNEYS.

FIG. 5

Fotentei Aug 21 119230 ontten STATES ATENT" oeeteno SAMUEL l. nnsnnnn, on non-snow, TEXAS.

' nnttt Application filed March. 9, 1920 Sonia! Ho. tenet J.

To all whom it may concern:

Be it known that I, SAMUEL F. BASHARA, citizen of the United States, residing at Houston, in the county of Harris and State shown in Figures 2 end 4 Mound its upper end. These coiian's are preferably, screwed on to the shank and the grooves or collars as the case me be ereprovideci to form on 5 of Texas, have invented certain new and useennuinr shoui er with which n fishing toot,

fui Improvements in e Drill Bit,ot which the (of weii known construction) may he enfoiiowing is e specification. gegeti to puii the bit out of the bone should.

fhis invention relates to new and usefui it heeon'ie twisteti off from stem in diiiiimprovements in n chiii hit, The upper end of the sheni: has a, hinnh m @ne object of the invention is orovide 1-, ab v the tin'eacis which fits ,2 hit of the ohei'eeter descriheci onts the ntijneent end of ting blades or points which are tieteehehie from the shank of the hit.

Another Object is provide hit L 15 of hit shank and detachable cutt'l' attached to said shank anti heoheei, o

inforoeci, means reinforcing" shonioieis fenneti i oegreiiy with the she? iieci rih e GEES:

fencing hiecies in ti section Ft A 1& i oessive edges steps, so

when one cntti log me e H J. i iiSihng toot w i M? otnei" oh geo enter rein onn lode.

-2 i 1 snows n. pens eetwe "new J2 oven penspeotwe @i se Fir q a Lott Refemnng now moire pnntieniei ten ' wherein iiite nnnieneis o-E mzerenee sitniier penin eeoh th nies t nnnoei'ni 1 refers to the shenh the hit 'Wiiiohis tnhnier in form at its nope? end end interneiiy thneeiieoi to receive the tower enoi oi the ch'iii stem. The tn'hniei part of this shank hos ennnioi' grooves 2 es shown in l igntes t and 3, or onnniion ooiiein 3, es

The sh .1 e w J Wanton emenet now n disohetge on 1 F shown one i eon sift-iii? thetethnon opposite o eentm'i Wat 13, Which continues on down through the blade section and diverges forming the Water courses 14, 14: through which water is discharged on to the cutting points of the blades.

What I claim is:

1. A drill bit, including a shank having a transverse dovetailed groove, a blade section formed with cutting blades, a transverse dovetailed rib carried by the blade section and fitting into the groove and detachably securing the blade section to the shank and a reinforcing shoulder fitting against the rear side only of each blade, said shoulders being formed integrally and depending from said shank.

2. A drill bit, including a shank, having a transverse dovetailed groove, a blade section, a transverse dovetailed rib carried by the blade section and fitting in said groove, oppositely curved cutting b ades formed integrally with the blade section, and a reinforcing shoulder fitting against the rear side only of each blade, said shoulders depending from and being vformed integrally With the shank, the front sides of the blades being substantiall flush with corresponding sides of the sha 3. A drill bit includin a shank, cutting blades carried by one en ofthe shank, the front side of each blade being formed with cutting edges arranged in stepped relation.

4. A drill bit including a shank, cutting blades carried by one end thereof, the sides of each blade being formed with cutting ed es arranged in stepped relation.

11 testimony whereof I have signed my name to this specification in the presence cit a subscribing Witness.

SAMUEL l BASHARA.

Witness:

E. V. Hannvvar. 

